The witnesses gave 'contradictory' accounts/statements/descriptions of the accident. [=they described the accident in ways that did not agree with each other]
Your argument is 'self-contradictory'.
a 'self-contradictory' statement
(..) everything's gonna be fine. Okay? Okay, baby? She just cut her fucking arm off. Does this sound fine to you? These inscriptions are confusing and sometimes contradictory. But they're consistent about one thing: In order to stop this, the possessed must be cleansed. Purified. (..)2013 Evil Dead